7-63. Sketch a unit circle. In your circle, sketch in an angle that has: a. A positive cosine and a negative sine. b. A sine of -1. C. A negative cosine and a negative sine. d. A cosine of about -0.9 and a sine of about 0.4. e. Could an angle have a sine equal to 0.9 and cosine equal to 0.8? Give an angle or explain why not.